prove that cos(pi/3+x)=(cos(x)-√3sin(x))/2 using sum rule
Answers
Answered by
1
Answer:
We know that,
cos
(
A
+
B
)
=
cos
A
cos
B
−
sin
A
sin
B
Substituting ,
A
=
π
3
and
B
=
x
,we get
cos
(
π
3
+
x
)
=
cos
(
π
3
)
cos
x
−
sin
(
π
3
)
sin
x
cos
(
π
3
+
x
)
=
1
2
cos
x
−
√
3
2
sin
x
cos
(
π
3
+
x
)
=
1
2
(
cos
x
−
√
3
sin
x
)
So,
Cos (pi / 3 + x) = 1/2 (cos x root 3 sin x), is not true.
i.e.
cos
(
π
3
+
x
)
=
1
2
(
cos
x
3
√
sin
x
)
, is not true .
SORRY FOR THIS TYPE OF ANS BECAUSE I DON'T KNOW CODING IN BRAINLY.
HEY MATE IF YOU LIKE MY ANS PLS MARK ME AS BRINLIEST...
Similar questions